IN KNEED OF ICE: Tracy McGrady (left), who limped off the court in the final minutes of his second game as a Knick with knee troubles, drives to the basket against Luc Mbah a Moute during the Bucks' 83-67 victory last night. Photo: Neil Miller

Uh-oh.

Tracy McGrady’s comeback took a troubling turn when the new Knick limped off the court in the final minutes of his second game.

The cursed Knicks limped to a horrifying 83-67 loss to the Bucks and were booed off the court by a surly Garden crowd after scoring their season low.

McGrady said afterward he knocked knees twice and wouldn’t guarantee he’ll be healthy enough to face the Celtics tonight in Boston.

“Hopefully it’s not sore [today],” McGrady said. “Maybe I’ll lace them up and play, but we’ll see. We’ll see how it feels before the game.”

It was a buzzkill evening on all levels — none worse than McGrady’s knees. The Knicks’ pitiful offensive showing — 26 points in the second half — overshadowed the warm halftime ceremony to honor the 40th anniversary of the Knicks’ 1969-70 championship team. These Knicks dropped 17 games under .500, losers of seven straight — their longest such streak since 2008 — and the fans booed for the game’s final minute.

All those good vibes from McGrady’s Saturday-night, 26-point debut disappeared.

McGrady was held to 15 points and shot just 5 of 14. McGrady was pulled with 3:38 left after injuring himself right before hitting a 3-pointer. After he limped to the bench, trainers wrapped his left knee — the same knee that underwent microfracture surgery one year ago today. The scene did not look promising.

Still feeling the effects of his 32-minute Saturday outing — his first game since Dec. 23 — McGrady at the end looked as old as anniversary honorees Bill Bradley and Walt Frazier.

McGrady later explained he first injured his knee in the second quarter.

“In the first half, I knocked knees with somebody. I didn’t really feel it until I came in here and sat 15-20 minutes and went out,” McGrady said. “Toward the end, I banged knees again. Coach saw me limping, so he pulled me out.”

Mike D’Antoni on Sunday wondered if McGrady would able to play both ends of his first back-to-back set, and Knicks doctors may lean on the side of caution.

“I think he just got bumped,” D’Antoni said. “I don’t think it was anything old. He asked out, then he hit a three. He was kind of limping and stuff. It seemed like the right thing to do, take him out. [Today], I have no idea but I don’t think it’s anything old.”

McGrady didn’t seem to have his shooting legs from the start, coming up short on his jumpers and looking less fluid. In his debut Saturday, McGrady took himself out for most of overtime because he didn’t have any legs left and rubbed his knee on the bench.

Last night he looked sloppy. At one juncture, he lost his dribble on a drive, then recovered and forced a wild jumper that missed badly.

“I felt light on my feet [at the start],” McGrady said. “I felt energized and ready to play. But coming out at halftime, I knew I slowed down a bit.”

The Knicks were annihilated by Bucks center Andrew Bogut, who scored 24 points with 20 rebounds and five blocks. Bogut outclassed David Lee, who made the All-Star Game as an injury replacement over Bogut. After dunking late in the first half, Bogut stared down Lee.

D’Antoni started newcomer Sergio Rodriguez at point guard as Chris Duhon received his first DNP and the offense stalled. The Knicks shot 33.8 percent and Rodriguez had one assist and three turnovers, shooting 2 of 8.

During the halftime ceremony, Frazier said, “We personified team.”

The modern-era Knicks have personified losing for the past nine years, and played the part. Al Harrington got the yips on an uncontested lay-in he directed off the rim. Danilo Gallinari, a second-year player whose hit the rookie wall hard, had an erratic night — five points, 2 of 8.

When newcomer Eddie House missed on a hard drive in the fourth quarter, he started yapping at the official while the Bucks sprinted the other way. In transition, Jerry Stackhouse, House’s man, buried a left-corner 3-pointer with House still at halfcourt to put Milwaukee up 70-61 with 8:44 left.